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m_lastDrawnRect.translate( itemRect.left(), itemRect.top() );
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// 3.2. decompose paint region in rects and send paint events
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QVector<QRect> rects = compoundRegion.unite( m_lastDrawnRect ).rects();
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for ( int i = 0; i < rects.count(); i++ )
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modifiedRect = compoundRegion.boundingRect() | m_lastDrawnRect;